Swift:单击UICollectionView的单元格并打开AlertViewController

Question

在我的应用程序中,我使用的是UICollectionView.现在我想在点击集合视图的任何单元格时开发一个UIAlertController.我开始使用以下代码:

extension HomeViewController: UICollectionViewDataSource {

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    …
}

// specify cells
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    ….
}

// called when widget is moved
func collectionView(_ collectionView: UICollectionView, moveItemAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
        …
}

// called when clicked
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    print("Got clicked!")
}

}

但不知何故,"点击了!" 永远不会打印.

Answer 1

尝试下一个:

extension HomeViewController: UICollectionViewDataSource, UICollectionViewDelegate {

}

要么

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
   ...
   cell.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(tap(_:))))
}

func tap(_ sender: UITapGestureRecognizer) {

   let location = sender.location(in: self.collectionView)
   let indexPath = self.collectionView.indexPathForItem(at: location)

   if let index = indexPath {      
      print("Got clicked on index: \(index)!")
   }         
}